YouTube recently launched a 3D channel. I was going to use this opportunity to brag about how many pairs of 3D glasses I have but then realized you can select how you want to view them. Truth be told, the cross-eyed version looks better than the red and blue glasses version (although it will give you an eyeball hangover).
This one (of the Roosevelt Island tram) is my favorite so far. I recommend watching it full screen with your lights off.